High-tech wound dressing fights infection in mouse trial

Jul 10, 2012 by David Tenenbaum

(Phys.org) -- An ultra-thin layer of polymer impregnated with a surgical anti-bacterial aided healing by preventing infection in a mouse study performed at the University of Wisconsin-Madison.

Using a technology developed in the lab of Nicholas Abbott, a professor of chemical engineering, Abbott, Ankit Agarwal and colleagues crafted a polymer nanofilm containing , and then stamped it onto a biologic that is already on the market.

The commercial dressing is sometimes called a skin substitute because it is embedded with that promote healing, and so it is a prime treatment for burns and persistent wounds. But Agarwal, an honorary associate in the UW-Madison Department of Chemical Engineering, notes that infection can block healing in as many as 20 percent of patients.

To fight infection, doctors can place a gauze containing chlorhexidine on the biological dressing, but the high concentration of the anti-bacterial kills and retards healing, and the gauze must periodically be re-applied.

The nanotechnology approach releases a much smaller dose of chlorhexidine, and in the mouse study described today in the online edition of the journal Biomaterials, it also blocked infection while promoting healing.

"Our goal was to reduce the amount of antibacterial agent needed, so it's not toxic to the healing cells, just to bacteria, and to reduce the need to reapply the solution," says Agarwal. "By incorporating this nanofilm on the wound-contact surface of the skin substitute, we provide a sustainable and prolonged localized release of the on the wound."

In the first study to test the use of specially treated nanofilms to speed healing in an , the new material reduced the number of bacteria colonies by 99.9 percent after three days, Agarwal says. "In burns and chronic ulcers, if we can prevent infection for three days following the application of the skin substitute, there is a 90 percent chance the treatment will be successful."

The study was funded by the National Institutes of Health and an innovation and economic development research grant from the Graduate School at UW-Madison. Veterinary surgeon Jonathan McAnulty at UW-Madison directed the animal study, and burn surgeon Michael Schurr, at the University of Colorado, Denver, provided input on the human, clinical aspects.

Explore further: Team discovers evolutionary mechanism that allows bacteria to resist antibiotics

Related Stories

Artificial skin system can heal wounds

Dec 20, 2007

A new study in Artificial Organs tested the effects of a wound dressing created with hair follicular cells. The findings reveal that skin substitutes using living hair cells can increase wound healing.

Study uses bone marrow stem cells to regenerate skin

Jan 14, 2009

A new study suggests that adult bone marrow stem cells can be used in the construction of artificial skin. The findings mark an advancement in wound healing and may be used to pioneer a method of organ reconstruction. The ...

A second skin

Nov 17, 2009

Despite advances in treatment regimens and the best efforts of nurses and doctors, about 70% of all people with severe burns die from related infections. But a revolutionary new wound dressing developed at ...

Recommended for you

Cell imaging gets colorful

2 hours ago

The detection and imaging of protein-protein interactions in live cells just got a lot more colourful, thanks to a new technology developed by University of Alberta chemist Dr. Robert E. Campbell and his ...

New strategy to combat 'undruggable' cancer molecule

2 hours ago

Three of the four most fatal cancers are caused by a protein known as Ras; either because it mutates or simply because it ends up in the wrong place at the wrong time. Ras has proven an elusive target for ...

Chemists find a way to unboil eggs

4 hours ago

UC Irvine and Australian chemists have figured out how to unboil egg whites – an innovation that could dramatically reduce costs for cancer treatments, food production and other segments of the $160 billion ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.